% !TEX TS-program = XeLaTeX
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%  哈尔滨工程大学本硕博论文 XeLaTeX 模版 —— A3封面
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%  版本：1.0.0
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%  修改者：Leo LiWenhui lwh@hrbeu.edu.cn
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%  编译环境1：Ubuntu + TeXLive 2021
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\documentclass[a4paper]{article}
\usepackage{pdfpages}
\begin{document}

\includepdf[pages={1-2}]{main.pdf} 
\includepdf[pages={1-2}]{spine.pdf}
\includepdf[pages={3-}]{main.pdf} 

\end{document}
